Just out of curiosity, do those two "stem attachment bolts" that hold the fork to the frame (?) ever decide to just loosen up over time?
I recently swapped out stems. Took the bike to a local shop and they did the work for me because I was told that a stem swap on the speed concept isn't for the faint of heart. Sweet.
That was about two months ago. Since then, I've ridden the bike on the trainer and about 3x on the road, yesterday being the most recent. Well, I was descending, cruising around 35mph, and the front of the bike started to wobble. I thought it was a crosswind, but I checked it out anyway. Well, I could move the basebar laterally independent of the fork.
So, I did some roadside surgery, never having wrenched this bike before. I discovered that the two "stem attachment bolts" that should have been torqued to 10nm were torqued to about 3nm. I tightened 'em up and all of the remaining bolts in there, as well as finally getting the stem cover back on (which is a huge PITA if you have di2... any tips?).
Needless to say, is that a simple error on the bike shop's part (that could have killed me) or do those bolts just tend to back themselves out for two months time?